Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Study on Effects of Pressure Ratio on the Wall-impingement Spray Characteristics of Nitrogen Gas using CNG Injector

  • Pham, Quangkhai (Department of Mechanical Engineering, Graduate School of Chonnam National University) ;
  • Chang, Mengzhao (Department of Mechanical Engineering, Graduate School of Chonnam National University) ;
  • Choi, Byungchul (School of Mechanical Engineering, Chonnam National University) ;
  • Park, Suhan (School of Mechanical and Aerospace Engineering, Konkuk University)
  • Received : 2022.01.05
  • Accepted : 2022.02.03
  • Published : 2022.03.31
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Abstract

In this study, an experimental investigation on the effects of the pressure ratio on the wall-impingement spray characteristics of nitrogen gas using a compressed natural gas (CNG) injector was conducted. The transient development of the impingement spray was recorded by a high speed camera with Z-type Schlieren visualization method. The spray behavior under various pressure ratio conditions were analyzed. The experimental results showed that the pressure ratio has positive effect on the development of spray wall-impingement. The effects of the above factor were evaluated in a constant volume chamber at atmospheric conditions. The data from test showed that, with the increase of the pressure ratio, the spray tip penetration (STP) quickly increases before the impingement and gradually increases after the impingement. Additionally, the spray velocity first increases and then sharply decreases on regardless of the injection pressure level. As the spray spreading angle increases, spray area and volume increases rapidly with the increase in STP at the beginning of injection, and finally entered a stable range, has a great correlation with the increase of pressure ratios.

Keywords

Acknowledgement

This study was financially supported under the Basic Science Research Program (2019R1A2C1089494) and the framework of the international cooperation program (2020K1A3A1A19088692), funded by the National Research Foundation of Korea (NRF) under the India-Korea International Cooperation Program.

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